The cumulative distribution function of the discrete random variable $$\(W\)$$, which takes only the values 6,7 and 8 , is given by $$\[ \mathrm{F}(W)=\frac{(w+3)(w-1)}{77} \quad \text { for } w=6,7,8 \]$$ Find $$\(\mathrm{E}(W)\)$$ (4)

Answer:

Knowledge points:

Solution: